{
 "ocl_version": "0.1.0",
 "name": "Stretta di u Ghjalsuminu",
 "slug": "stretta-di-u-ghjalsuminu",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 31.218496776813254,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 396.0,
   "end_distance_m": 398.0,
   "start_elevation_m": 224.60578247982022,
   "end_elevation_m": 225.23015241535649,
   "min_gradient_pct": -3.6359617029461333
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 30.109873044609497,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 389.0,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 222.63172262768137,
   "min_gradient_pct": -2.9631056938834868
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.129684647844215,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 391.0,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 223.2349106687353,
   "min_gradient_pct": -3.0985642321360274
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.12305803213485,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 384.0,
   "end_distance_m": 394.0,
   "start_elevation_m": 221.1676761986369,
   "end_elevation_m": 224.0799820018504,
   "min_gradient_pct": 1.4561593884224067
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.55080836031661,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 406.0,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 227.4385881084064,
   "min_gradient_pct": 4.401020433697909
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.454399436772178,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 384.0,
   "end_distance_m": 409.0,
   "start_elevation_m": 221.1676761986369,
   "end_elevation_m": 228.28127605782996,
   "min_gradient_pct": 4.460845250466036
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 27.423460132473565,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 368.0,
   "end_distance_m": 418.0,
   "start_elevation_m": 217.00591119553093,
   "end_elevation_m": 230.7176412617677,
   "min_gradient_pct": 5.94419960841816
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 24.851220029448,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 320.0,
   "end_distance_m": 420.0,
   "start_elevation_m": 206.23302312322357,
   "end_elevation_m": 231.08424315267158,
   "min_gradient_pct": 6.562262999891118
  }
 ],
 "shape": {
  "ascent_concentration": 0.446,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 181.0,
  "shape_class": "sustained"
 },
 "length_m": 421.60764782953066,
 "start_elevation_m": 173.58970137987885,
 "end_elevation_m": 231.26199235693514,
 "endpoint_gain_m": 57.67229097705629,
 "overall_gradient_pct": 13.679137765635367,
 "accumulated_ascent_m": 57.82721918866309,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.129684647844215,
   "start_distance_m": 386.0,
   "end_distance_m": 391.0,
   "midpoint_distance_m": 388.5,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 223.2349106687353,
   "start_xy": [
    1178487.0477739025,
    6115478.379808403
   ],
   "end_xy": [
    1178483.6168067937,
    6115474.825314469
   ]
  },
  "max_10m": {
   "gradient_pct": 29.12305803213485,
   "start_distance_m": 384.0,
   "end_distance_m": 394.0,
   "midpoint_distance_m": 389.0,
   "start_elevation_m": 221.1676761986369,
   "end_elevation_m": 224.0799820018504,
   "start_xy": [
    1178488.2632644626,
    6115479.968072454
   ],
   "end_xy": [
    1178481.1307546392,
    6115473.146164481
   ]
  },
  "max_20m": {
   "gradient_pct": 28.55080836031661,
   "start_distance_m": 386.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 396.0,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 227.4385881084064,
   "start_xy": [
    1178487.0477739025,
    6115478.379808403
   ],
   "end_xy": [
    1178469.7297335144,
    6115469.4717291985
   ]
  },
  "max_25m": {
   "gradient_pct": 28.454399436772178,
   "start_distance_m": 384.0,
   "end_distance_m": 409.0,
   "midpoint_distance_m": 396.5,
   "start_elevation_m": 221.1676761986369,
   "end_elevation_m": 228.28127605782996,
   "start_xy": [
    1178488.2632644626,
    6115479.968072454
   ],
   "end_xy": [
    1178466.8349103853,
    6115468.684329013
   ]
  },
  "max_50m": {
   "gradient_pct": 27.423460132473565,
   "start_distance_m": 368.0,
   "end_distance_m": 418.0,
   "midpoint_distance_m": 393.0,
   "start_elevation_m": 217.00591119553093,
   "end_elevation_m": 230.7176412617677,
   "start_xy": [
    1178499.317726296,
    6115491.441436644
   ],
   "end_xy": [
    1178458.255521128,
    6115465.9794743555
   ]
  },
  "max_100m": {
   "gradient_pct": 24.851220029448,
   "start_distance_m": 320.0,
   "end_distance_m": 420.0,
   "midpoint_distance_m": 370.0,
   "start_elevation_m": 206.23302312322357,
   "end_elevation_m": 231.08424315267158,
   "start_xy": [
    1178495.3366007966,
    6115525.420247505
   ],
   "end_xy": [
    1178456.3631406687,
    6115465.3322524475
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.0985642321360274,
   "start_distance_m": 236.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 238.5,
   "start_elevation_m": 193.67549265950527,
   "end_elevation_m": 193.52056444789847,
   "start_xy": [
    1178570.0425764506,
    6115562.458717231
   ],
   "end_xy": [
    1178565.308301157,
    6115560.85041457
   ]
  },
  "min_10m": {
   "gradient_pct": 1.4561593884224067,
   "start_distance_m": 232.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 237.0,
   "start_elevation_m": 193.42445448622243,
   "end_elevation_m": 193.57007042506467,
   "start_xy": [
    1178566.8911255507,
    6115564.713597689
   ],
   "end_xy": [
    1178564.3614460984,
    6115560.528754039
   ]
  },
  "min_20m": {
   "gradient_pct": 4.401020433697909,
   "start_distance_m": 164.0,
   "end_distance_m": 184.0,
   "midpoint_distance_m": 174.0,
   "start_elevation_m": 187.9969469355152,
   "end_elevation_m": 188.8771510222548,
   "start_xy": [
    1178514.6481160428,
    6115604.014356463
   ],
   "end_xy": [
    1178524.3610950005,
    6115586.620897409
   ]
  },
  "min_25m": {
   "gradient_pct": 4.460845250466036,
   "start_distance_m": 162.0,
   "end_distance_m": 187.0,
   "midpoint_distance_m": 174.5,
   "start_elevation_m": 187.88793473261236,
   "end_elevation_m": 189.00314604522887,
   "start_xy": [
    1178513.8259915498,
    6115605.831839157
   ],
   "end_xy": [
    1178526.9490996439,
    6115585.103586641
   ]
  },
  "min_50m": {
   "gradient_pct": 5.94419960841816,
   "start_distance_m": 147.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 186.76085875073218,
   "end_elevation_m": 189.73295855494126,
   "start_xy": [
    1178511.499954331,
    6115620.650393435
   ],
   "end_xy": [
    1178535.689370357,
    6115580.269930254
   ]
  },
  "min_100m": {
   "gradient_pct": 6.562262999891118,
   "start_distance_m": 92.0,
   "end_distance_m": 192.0,
   "midpoint_distance_m": 142.0,
   "start_elevation_m": 182.73844094741378,
   "end_elevation_m": 189.3007039473049,
   "start_xy": [
    1178531.8433308145,
    6115670.555008427
   ],
   "end_xy": [
    1178531.2624407164,
    6115582.574735362
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 31.218496776813254,
   "start_distance_m": 396.0,
   "end_distance_m": 398.0,
   "midpoint_distance_m": 397.0,
   "start_elevation_m": 224.60578247982022,
   "end_elevation_m": 225.23015241535649,
   "start_xy": [
    1178479.283292759,
    6115472.407029134
   ],
   "end_xy": [
    1178477.3931733044,
    6115471.753233717
   ]
  },
  "max_3m": {
   "gradient_pct": 30.109873044609497,
   "start_distance_m": 386.0,
   "end_distance_m": 389.0,
   "midpoint_distance_m": 387.5,
   "start_elevation_m": 221.72842643634309,
   "end_elevation_m": 222.63172262768137,
   "start_xy": [
    1178487.0477739025,
    6115478.379808403
   ],
   "end_xy": [
    1178485.2245380625,
    6115475.997412325
   ]
  }
 },
 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.043,
   "obstruction_max_height_m": 7.36,
   "flagged_windows_m": [
    3,
    5,
    10,
    20,
    25
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "33abfff569d4360542e616d0d42c1b94d0a711fa",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "fr-co1",
   "road_pbf": "block-batch-fr-co1.osm.pbf",
   "region_key": "france",
   "crs": "EPSG:2154",
   "elevation_provider_key": "ign-lidarhd",
   "tile_index": "wms-grid",
   "authority": "bdtopo",
   "registry_pbf": "france-vosges-2026-09-16.osm.pbf",
   "tile_index_snapshot": "sha256:2a717d675f2607cc"
  },
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
   5.0,
   10.0,
   20.0,
   25.0,
   50.0,
   100.0
  ],
  "diagnostic_windows_m": [
   2.0,
   3.0
  ],
  "elevation_crs": "EPSG:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E1178-N6115_0m5@21LHDCorseUT-2025-04-02.tif"
  ],
  "calculated_at": "2026-09-25T00:20:51+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-co1.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-co1",
  "elevation_provider": "IGN LiDAR HD MNT 0.5 m",
  "elevation_licence": "Licence Ouverte / Open Licence 2.0 (Etalab) \u2014 \u00a9 IGN, LiDAR HD (MNT/MNS), data.geopf.fr; reproduction autoris\u00e9e avec mention de la source et de la date",
  "elevation_dataset": "LiDAR HD \u2014 MNT (sol) et MNS (surface), 0,50 m (Institut national de l'information g\u00e9ographique et foresti\u00e8re), RGF93 / Lambert-93 EPSG:2154, altitudes IGN69",
  "elevation_vertical_datum": "IGN69",
  "elevation_tile_ids": [
   "E1178-N6115"
  ],
  "elevation_blocks": [
   "21LHDCorseUT@2025-04-02"
  ],
  "ign_dalles": [
   "LHD_FXX_1178_6116_MNT_O_0M50_LAMB93_IGN78"
  ],
  "ign_missions": [
   "21LHDCorseUT"
  ],
  "ign_editions": [
   "2025-04-02"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_1178_6116_MNT_O_0M50_LAMB93_IGN78": "2025-04-02"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 23,
   "stations_resolved": 23,
   "width_median_m": 5.0,
   "width_p10_m": 3.05,
   "width_min_m": 2.0,
   "width_max_m": 8.0,
   "bounded_share": 0.348,
   "unbounded_share": 0.652,
   "confidence_median": 0.0,
   "width_median_bounded_m": 6.5,
   "window_m": [
    384.0,
    409.0
   ],
   "width_at_max25_m": 4.0,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 23,
    "stations_resolved": 23,
    "width_median_m": 6.5,
    "width_p10_m": 2.0,
    "width_min_m": 0.5,
    "width_max_m": 11.25,
    "bounded_share": 0.696,
    "unbounded_share": 0.304,
    "confidence_median": 1.0,
    "width_median_bounded_m": 5.88,
    "window_m": [
     384.0,
     409.0
    ],
    "width_at_max25_m": 4.5,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Alata",
  "county": "Corse-du-Sud",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}